My entire wardrobe costs less than that, and no, I am not lying.
It must be nice to have enough money to spend on such luxury. Is it really that much better than a $10 t-shirt?
Maybe it's silly but people do judge from appearance because it tells something about you. I have been watching this famous fashion photographer and he was talking about using an iPhone for last photoshoot and he noted that he can do it and charge full price for it only because he already has a name in the industry and a nobody will need to flash large and expensive cameras to justify the price asked.
Think what it it tells about you to wear really nice shirt. Firstly, it implies that you already sold something to someone for a lot of money and you got paid and bought that shirt, right? Secondly it implies dominance at least in one area, you are the person with the best shirt in the room so who knows what else you are best at. Silly but our primate brains easily get intimidated and extrapolate. There are also many other fallacies that our brains easily fall in, so looking impressive is a superpower actually.
Also, everything is a costume. If you are interviewing for a nerdy position you better look like a nerd but you can always be the nerd with the best nerdy shirt.
Around $200 and above, most are machined from aluminum, and require the user to supply their own switches and keycaps. My daily driver, whose USB connector seems to be reaching EOL, is a heavy-ass chunk of bright blue Alu, makes noise like a machine gun when I need to correct someone on the internet, and has limited edition keycaps in a fun (imo) purple-and-cyan color scheme. Total cost of this thing was probably $250~$300, but I'm happy.
I have over $1k worth of keyboards and related hardware strewn about my apartment, and the only reason I've considered selling some of my collection is to buy fancier pieces. To each their own.
The people who wear those shirts also have expensive shoes. Get the tie right and you can get away with a slightly less expensive suit for technical sales meetings.
A clean shave and neat, well cut hair help too.
Its interesting to look at shoes, tells you a lot about a persons status in a big organisation.
Having said that, my daughter bought me some checkerboard vans so I wear those everywhere now.